The results showed that there were significantly positive linear relationships between the inhibitory rates of wheat seed germination and root elongation and the CODcr of the mother liquor scraps.

The toxicity of MSG wastewater to the test crops was in the order of tomato >amp;gt; Chinese cabbage >amp;gt; wheat, indicating that tomato was the most sensitive to the wastewater, and could be considered as an ideal toxic bioindicator.

The initial stage of amino acid metabolism was intensified in germinating wheat seeds with exogenous glutamine and proline.

The strain formed extracellular phenol oxidases during surface growth on a liquid medium in the presence of guayacol and copper sulfate, as well as during submerged cultivation in liquid medium containing wheat bran and sugar beet pulp.

Field practice has long proved that the application of straw ash on newly reclaimed paddy soils derived from the lacustrine deposit in the flooded areas of Li-Shia-Ho,Kiangsu, greatly increases the yields of wheat,barley and other upland crops.Field experimentes were conducted to compare the effect of superphosphate with straw ash as basic dressings at a same level of phosphate fertilizer.Results revealed that superphosphate has a similar effect as straw ash. Laboratory investigations gave evidences that...

Field practice has long proved that the application of straw ash on newly reclaimed paddy soils derived from the lacustrine deposit in the flooded areas of Li-Shia-Ho,Kiangsu, greatly increases the yields of wheat,barley and other upland crops.Field experimentes were conducted to compare the effect of superphosphate with straw ash as basic dressings at a same level of phosphate fertilizer.Results revealed that superphosphate has a similar effect as straw ash. Laboratory investigations gave evidences that fixation of available soil phosphorus takes place as the flooded soil dried out through reclamation and drainage.

Chemical analysis of seperate plant organs of green manures at various stages of growth collected from representative districts of Central China showed that the accumulation of green mass and the absorption of nutrients chiefly occurred during the last 30 to 45 days before plowing-under.Astragalus sinicus,the principal leguminous green manure in central China,showed some correlation in P and K contents with soil fertility,whereas the nitrogen content remained practically constant regardless the nutritive status...

Chemical analysis of seperate plant organs of green manures at various stages of growth collected from representative districts of Central China showed that the accumulation of green mass and the absorption of nutrients chiefly occurred during the last 30 to 45 days before plowing-under.Astragalus sinicus,the principal leguminous green manure in central China,showed some correlation in P and K contents with soil fertility,whereas the nitrogen content remained practically constant regardless the nutritive status of the soil.It was esti- mated that the nodular bacteria of Astragalus sinicus assimilated about 105 kg of nitrogen per hectare at the yield of 37,500 kg of green mass. Green-house experiments revealed that manure crops possessed a stronger power in assi- milating their phosphorus from rock phosphate and magnesium from serpentine as compared with winter wheat.Laboratory experiments with exciled root also demonstrated that the root systems of manure crops have a stronger absorption power,greater cation-exchange capacity,larger absorbing surface area and more intensive rate of respiration than that of the wheat.Among the tested manure crops,Raphanus sativus,a cruciferous plant widely planted on infertile soils,has been proved the best variety.

Photophosphorylation of isolated chloroplasts mediated by phenazine methosulphate(PMS) menadione bisulphite(Vit. K), flavinmononucleotide(FMN) as well as by ferricyanide[Fe(CN)_6] and its coupled Hill reaction was studied in flashing light. Natural sunlight focused by convex lenses to an intensity of about 300,000lux and intercepted by a rotating disc was used as the flashing source(Fig. 1). Chloroplasts were prepared from young leaves of water-cultured wheat seedlings as described earlier. ATP was measured...

Photophosphorylation of isolated chloroplasts mediated by phenazine methosulphate(PMS) menadione bisulphite(Vit. K), flavinmononucleotide(FMN) as well as by ferricyanide[Fe(CN)_6] and its coupled Hill reaction was studied in flashing light. Natural sunlight focused by convex lenses to an intensity of about 300,000lux and intercepted by a rotating disc was used as the flashing source(Fig. 1). Chloroplasts were prepared from young leaves of water-cultured wheat seedlings as described earlier. ATP was measured as ~(32)P incorporated by the method of Nielsen and Lehninger.With flashes of 1 millisecond, the yield per flash increases with, the length of the dark time up to a maximum. The maximum dark time for the Vit. K and Fe(CN)_6 coupled Hill reaction is 0.05-0.07 sec at 10-20℃(Fig. 2, 3 & 4). For PMS, the maximum dark time is 0.03 sec(Fig. 2). Higher temperature shortens the dark time in both Vit. K and PMS systems. The maximum yield per flash is higher in the Vit. K system than with PMS. Yield per flash increases with temperature(Fig. 2).o-Phenanthroline(3×10~(-5)M) inhibits the dark reaction in both systems to a similar extent. The maximum yield per flash is inhibited by about 85% in the Vit. K system and only 40% in the PMS system. sThe similarity of the dark time requirement of the photophosphorylation mediated by Vit. K, FMN, Fe(CN)_6 and its coupled Hill reaction to that of photosynthesis indicates that the limiting reaction is perhaps common to all, involving the photosynthetic electron-carrier chain, including the participation of molecular oxygen. The short dark in(?)erval required by the PMS system as well as its different response to o-phenanthroline shows that PMS mediates a different pathway probably a"short cut".Further investigations on the dependence of yield on the flash duration and its relation to temperature, cofactors and inhibitors will be reported in a succeeding paper.